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Preparation and Characterization of the Soft Magnetic FeCo-based Amorphous Alloy with Enhanced Magnetic Properties and Thermal Stability

Published online by Cambridge University Press:  17 March 2011

Martin Hollmark ,
Victor Tkatch ,
Sergey Khartsev  and
Alex Grishin
Martin Hollmark
Affiliation:
Department of Condensed Matter Physics, Royal Institute of Technology, S-100 44 Stockholm, Sweden
Victor Tkatch
Affiliation:
Department of Condensed Matter Physics, Royal Institute of Technology, S-100 44 Stockholm, Sweden
Sergey Khartsev
Affiliation:
Department of Condensed Matter Physics, Royal Institute of Technology, S-100 44 Stockholm, Sweden
Alex Grishin
Affiliation:
Department of Condensed Matter Physics, Royal Institute of Technology, S-100 44 Stockholm, Sweden
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Abstract

A glassy structure was formed in the Fe40Co40P14B6 alloy by melt-spinning technique. The as-quenched 2-8 mm wide and 15-30 [.proportional]m thick ribbons exhibit good soft magnetic properties: the saturation magnetization of 1.45 T, the coercive force of 4 A/m and maximum differential permeability at 60 Hz of about 90000. The FeCo-based glass crystallizes via eutectic reaction into a mixture of an austenite and a b.c. tetragonal Fe3P-like phase similar to that of the well-known Fe40Ni40P14B6metallic glass, but at temperatures about 60 K higher than the latter. The evaluation of the thermodynamic and kinetic parameters of crystallization process brought us to the conclusion that the improved thermal stability of the Fe40Co40P14B6 glass is caused by the enhanced interfacial nucleus-glass energy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 644: Symposium L – Supercooled Liquid, Bulk Glassy and Nanocrystalline State of Alloys , 2000 , L7.2
Copyright
Copyright © Materials Research Society 2001

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